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        div {
            /* none；默认，没有装饰线（最常用） */
            /* text-decoration: underline;下划线 */
            /* text-decoration:line-through; 删除线*/
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            /* overline:上划线 */
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        a {
            /* 取消a（链接）默认的下划线 */
            text-decoration: none;
            /* 重点记住如何添加下划线？如何删除下划线？其余了解即可 */
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    <div>许毓翀大狗蛋</div>
    <a href="#">许毓翀大狗蛋</a>
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